Polycell collaborative coupling acoustic meta-material design method

Abstract

The invention discloses a polycell collaborative coupling acoustic meta-material design method. The method comprises a structure design method with insufficient localization rigidity and a structure design method with sufficient localization rigidity, wherein the structure design method with insufficient localization rigidity adopts a separating framework with localization rigidity lower than thinplate rigidity to separate local area resonance cells, so that strong coupling resonance behaviors of a single cell is generated, and a polycell combined structure with lumped coupling resonance effect is formed; the structure design method with sufficient localization rigidity adopts the separating framework with localization rigidity higher than thin plate rigidity, so that resonance of a single cell is not mutually affected within a design frequency band; and cells with gradient distribution of multiple thin plate widths, thin plate thicknesses or additionally mass block weight structure parameters define a polycell combined structure. The polycell collaborative structure can be applied to various transfer tools and various building decorations, and provides a brand-new denoising scheme for creating a low-noise environment.

Description

technical field [0001] The invention belongs to the technical field of acoustic metamaterials, and in particular relates to a multi-cell cooperative coupling acoustic metamaterial structure design method for realizing low-frequency broadband super-strong sound attenuation. Background technique [0002] Existing sound insulation structures are generally heavy and thick homogeneous plates, which are difficult to meet the actual noise reduction requirements in areas with high requirements for lightweight. In addition, the sound insulation performance of these homogeneous sound insulation structures obeys the change rule of the mass law, and the sound insulation effect is good in the high frequency band, but the sound insulation performance in the low frequency band is very poor. This severely restricts the design of the sound insulation components of the vehicle and the sound insulation structure of the hall, and poses technical challenges to low frequency sound insulation. Ac...

AI Technical Summary

Problems solved by technology

However, for practical engineering applications, it has been repeatedly emphasized that there are two problems: First, the stiffness of the elastic film is very low, the acoustic and mechanical properties are unstable, and it strongly depends on the film tension, which is difficult to quantify control; secondly, the thin films generally constituting elastic thin film acoustic metamaterials are often made of superelastic silicone rubber materials. tension, which can significantly shorten material life

However, the elastic modulus of the hard thin plate is much larger than that of the elastic film, and its natural frequency is naturally much higher, so it is difficult to design local resonance low-frequency vibration and noise reduction structures

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